At first blush, the resignation of America’s Director of the National Counterterrorism Center in wartime — indeed, in protest against a war with the world’s foremost exporter of Islamist terror — is an unnerving development. Fortunately, the former director, Joe Kent, authored an open letter explaining the thinking that led him to abandon his post. A cursory survey of his deliberative process should reassure trepidatious Americans that they’re better off without him.

“Iran posed no imminent threat to our nation,” Kent wrote at the outset of his letter. If that’s his biggest problem with this war, then it calls into question ...

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